how to rebuild raid after disk failure in dell r720

The hard drives were more than six years old and were running non-stop. Then engineers opened the hermetic cover of both failed hard drives in a cleanroom environment to check for any mechanical failures. Initially, the printed circuit board was tested and found to be fully functional. Technical Inspection of Hard DrivesĪfter learning what happened and what kind of actions were taken after the RAID failure, we needed to inspect each member and understand the exact cause. He understood he could not do anything and escalated the case to further inspection and data recovery. Next, he removed the hard drives and connected them externally to a desktop computer and heard that the hard drives were making strange mechanical noise. Seeing that data was not accessible and the business operations were affected, the technician decided to recover server functionality himself.įirst, he tried to rebuild the RAID volume using RAID controller utilities and then ejected drives and replaced their slots in the server, which worsened the situation. If any other second one fails, the RAID arrays cannot function, and you lose access to data. As you know that RAID 5 volumes are redundant if only one drive fails. The second hard drive recently failed, and the RAID volume stopped working. But the hard disk drive delivery was delayed, and they also forgot about the server for a while.

So they planned to replace the failed hard drive.

The customer told us that one of the members died a few months ago. The Story of Failed PowerEdge R720 Server This information helps our engineers to inspect and solve the issue much faster. Like a medical doctor, we always ask questions to our customers to give us detailed information about device failure or any other data loss cases. In addition, most companies equip Dell servers with RAID 5 and 6 configurations high-performance and redundancy. The PowerEdge and EqualLogic series are top-rated due to the flexible choice of corps: “tower,” rack, or modular systems. The most important data we should retrieve is the Quickbooks database and shared fileserver.ĭell servers and storage systems are among the most popular storage devices. The IT technician described that two out of 3 members failed, and the server could not detect enough members to build the logical volume. Recently, we received a RAID 5 array case with three-member drives taken out from Dell PowerEdge R720 Server.

How to rebuild raid after disk failure in dell r720